[Bug 238705] Review Request: avr-gcc - Cross Compiling GNU GCC targeted at avr

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Summary: Review Request: avr-gcc - Cross Compiling GNU GCC targeted at avr


https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=238705





------- Additional Comments From rc040203 at freenet.de  2007-05-02 11:34 EST -------
(In reply to comment #6)
> Notice that the link above is THE install manual of THE libc for avr. Also avr
> has (rudimentary) C++ support, but no libstdc++ support.
Well, normally, g++ is tied to libstdc++ and is useless without libstdc++.

> Its libc also has no
> threading support etc. 
That's clear. Threads are part of the OS, so there is no way to support them
without OS.

> This is a microcontroller environment with as little as
> 512 bytes of total RAM (not Kbytes but bytes! including space for the stack).
I know.

> Thus most of the gcc features which require libc support simply do not apply.
Probably such as g++.

> Also see:
> http://gcc.gnu.org/install/specific.html#avr
> And notice how it says: "Use `configure --target=avr --enable-languages="c"'
This makes sense. AFAICT, c++ on the avr is not supported at all.

Anyway, a bug in your package:
./avr-g++ -v -c tmp.cc -o tmp.o
Using built-in specs.
Target: avr
Configured with: ../gcc-4.1.2/configure --prefix=/usr --enable-languages=c,c++
--target=avr --disable-nls --mandir=/usr/share/man --infodir=/usr/share/info
Thread model: single
gcc version 4.1.2
 /users/packman/src/rpms/SPECS/usr/bin/../libexec/gcc/avr/4.1.2/cc1plus -quiet
-v -iprefix /users/packman/src/rpms/SPECS/usr/bin/../lib/gcc/avr/4.1.2/ tmp.cc
-quiet -dumpbase tmp.cc -auxbase-strip tmp.o -version -fno-rtti
-fno-enforce-eh-specs -fno-exceptions -o /tmp/ccQf1d25.s
ignoring nonexistent directory
"/users/packman/src/rpms/SPECS/usr/bin/../lib/gcc/avr/4.1.2/../../../../include/c++/4.1.2"
ignoring nonexistent directory
"/users/packman/src/rpms/SPECS/usr/bin/../lib/gcc/avr/4.1.2/../../../../include/c++/4.1.2/avr"
ignoring nonexistent directory
"/users/packman/src/rpms/SPECS/usr/bin/../lib/gcc/avr/4.1.2/../../../../include/c++/4.1.2/backward"
ignoring nonexistent directory
"/users/packman/src/rpms/SPECS/usr/bin/../lib/gcc/avr/4.1.2/../../../../avr/sys-include"
ignoring nonexistent directory
"/users/packman/src/rpms/SPECS/usr/bin/../lib/gcc/avr/4.1.2/../../../../avr/include"
ignoring nonexistent directory "/usr/lib/gcc/../../include/c++/4.1.2"
ignoring nonexistent directory "/usr/lib/gcc/../../include/c++/4.1.2/avr"
ignoring nonexistent directory "/usr/lib/gcc/../../include/c++/4.1.2/backward"
ignoring nonexistent directory "/usr/lib/gcc/avr/4.1.2/include"
ignoring nonexistent directory "/usr/lib/gcc/../../avr/sys-include"
ignoring nonexistent directory "/usr/lib/gcc/../../avr/include"
#include "..." search starts here:
#include <...> search starts here:
 /users/packman/src/rpms/SPECS/usr/bin/../lib/gcc/avr/4.1.2/include
End of search list.
GNU C++ version 4.1.2 (avr)
        compiled by GNU C version 4.1.1 20070105 (Red Hat 4.1.1-51).
GGC heuristics: --param ggc-min-expand=64 --param ggc-min-heapsize=64013
Compiler executable checksum: b37c1702f0f613ffe6c2ea8cd679740a
 /usr/lib/gcc/../../avr/bin/as -o tmp.o /tmp/ccQf1d25.s


Note the c++ header search paths! These refer to the host's libstdc++'s headers,
not the target ones.

You want to use 
%configure --enable-version-specific-runtime-libs

This will cause gcc to search for libstdc++ only on its internal search paths.



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